Brak'lul

the word Brak'lul describes the appearance of unnecessary doubled organs in the klingon anatomy (1). With this klingons can survive wounds deadly to humans. The klingon spelling is bIraqlul(2).

Music band

There is a german Hip Hop band, who took the word as a band name. They explained it with the fact, that the lead singers of the band are identical twins. They're existing twice in a metaphorical way. If one would go away, the other would still be there, like with the klingon body parts.
This is addressed in the song "Brak'Lul Anthem" (3).